Question

Aluminum in 2g of an ore sample is determined by dissolving it and then precipitating with
Al(OH)3 and igniting to Al2O3, which is weighed. What % of aluminum was in the sample if the ignited
precipitate weighed 0.2385g (Al = 27, O = 16, H = 1)?

Answer 1

I haven't got the reactions to hand but seems you've ended up with:

\(\dfrac{0.2385}{(2 \times 27) + (3 \times 16)}\) moles of the precipitate \(Al_2 O_3\)

so you had that many moles of Al in the sample, and those moles have mass:

\(\dfrac{0.2385}{(2 \times 27) + (3 \times 16)} \times 27 \text{ g}\)

And so the %-age you seek is:

\(\dfrac{ \dfrac{0.2385}{(2 \times 27) + (3 \times 16)} \times 27 }{2} \text{ %}\)

Answer 2

Luella has a pond in her yard. She wants to surround it with 330 feet of fencing. The fencing is sold by the yard. How many yards should she buy?

Answer 3

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Answer 4

https://i.imgur.com/Wjmpc6D.png

Answer 5

Assessment items
Assessment started: undefined.
Item 1

Read the passage.

Dark Star

Giselle leaned against the mahogany bay horse, stroking the white diam

Answer 6

Okay I was gone for a minute BUT I'M BACK NOW

Answer 7

the scatter plot presents Ray's monthly electricity bills and amount of time ray

Answer 8

Which word shares a connotative meaning with the word cheap as it is used in this sentence?

Ashley thought her parents were being cheap when they bought ge

Answer 9

Which revision fixes the dangling modifier in the sentence?

Rowing through the rapids, the canoe began to fill with water.

Answer 10

dangling modifier

Answer 11

Misplaced Modifiers

Answer 12

For which literary work did Joseph Heller use his military experiences as a prima

Answer 13

Calc III Tutorial: Lagrange Multipliers

Answer 14

Can someone translate this for me?

Answer 15

Find the interest due on $1,090 at 8% for 5 years.

43.60
68.13
436.00
681.25

Answer 16

Now identify the simple subject and simple predicate.

The meeting began promptly at seven o'clock.

Answer 17

What can be inferred from these lines describing the pardoner in Chaucer's prolog

Answer 18

What is the rate of change of the linear relationship modeled in the table?

x y

Answer 19

Which of these best identifies the shift of mood in this sentence?

"If you were to sit more comfortably, you will not fall off.

Answer 20

Which scenario best matches the linear relationship expressed in the equation y = u221214x + 1,700?

Kent has $1,700 in his bank account and spends $14 each

Answer 21

The saying "Whoso is a man must be a nonconformist" is based on whose transcendentalist belief?
A.